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10 spectacular moons in our solar system

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Photo 5 of 11

Photo: NASA

5 of 11

Mars' Phobos

One of only two Martian moons, Phobos has been described as no more than a tiny rock. NASA also notes that Phobos is on a collision course with Mars. As NASA writes, "Phobos is nearing Mars at a rate of 1.8 [meters] every hundred years; at that rate, it will either crash into Mars in 50 million years or break up into a ring." It has a six-mile gouge in it called the Stickney crater, which experts believe was caused by a meteorite impact. Phobos is named for one of the mythical sons of the Greek god Ares, who is the Greek equivalent of the Roman god Mars.

Mars' Phobos

One of only two Martian moons, Phobos has been described as no more than a tiny rock. NASA also notes that Phobos is on a collision course with Mars. As NASA writes, "Phobos is nearing Mars at a rate of 1.8 [meters] every hundred years; at that rate, it will either crash into Mars in 50 million years or break up into a ring." It has a six-mile gouge in it called the Stickney crater, which experts believe was caused by a meteorite impact. Phobos is named for one of the mythical sons of the Greek god Ares, who is the Greek equivalent of the Roman god Mars.